| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 22 of October | Abercio | Saint Abercius of Hieropolis | Turkey | Turkey |
| 4 of January | Abrunculus | Saint Abrunculus | 490 France | |
| 14 of May | Abrunculus | Saint Abrunculus of Langres | France | 488 France |
| 2 of April | Abundius | Saint Abundius | 468 Italy | |
| 9 of April | Acacius | Saint Acacius of Mesopotamia | Iraq | |
| 17 of April | Acacius | Saint Acacius of Melitene | 435 Armenia | |
| 27 of November | Acarius | Saint Acarius of Noyon | 640 France | |
| 22 of April | Acépsimas | Saint Acépsimas | ||
| 29 of April | Achard | Saint Achard of Avranches | 1172 Switzerland | |
| 15 of May | Achilleus | Saint Achilleus Thaumaturge | Turkey | Greece |
| 6 of October | Adalbero | Saint Adalbero of Würzburg | 1090 Germany | |
| 23 of April | Adalbert | Saint Adalbert of Prague | 997 Czech republic | |
| 29 of August | Adelphus | Saint Adelphus of Metz | France | |
| 20 of September | Adelpreto | Saint Adelpreto of Arco | 1172 Italy | |
| 16 of December | Ado | Saint Ado | 875 | |
| 30 of June | Adolf | Saint Adolf of Osnabrück | 1224 Germany | |
| 19 of May | Adolphus | Saint Adolphus of Arras | 728 France | |
| 12 of June | Aeschylus | Saint Aeschylus | United kingdom | 1080 Sweden |
| 10 of September | Agabius | Saint Agabius of Novara | Italy | |
| 28 of April | Agapius | Saint Agapius of Cirta | 259 | |
| 1 of December | Agericus | Saint Agericus | France | 588 France |
| 31 of March | Agilulfus | Saint Agilulfus | 752 Germany | |
| 13 of January | Agricius | Saint Agricius | 300 Germany | |
| 17 of March | Agricola | Saint Agricola | 580 France | |
| 26 of February | Agricola | Saint Agricola of Nevers | 594 France | |
| 2 of September | Agricola | Saint Agricola of Avignon | France | |
| 9 of November | Agripino | Saint Agripino of Naples | Italy | |
| 1 of February | Agrippano | Saint Agrippano bishop and martyr | France | |
| 27 of May | Agustín | Saint Augustine of Canterbury | 605 United kingdom | |
| 28 of August | Agustín | Saint Augustine of Hippo | 354 Algeria | 430 Algeria |
| 31 of August | Aidan | Saint Aidan of Lindisfarne | Ireland | 651 United kingdom |
| 17 of November | Aignan | Saint Aignan of Orleáns | 453 France | |
| 2 of January | Airaldus | Saint Airaldus | 1146 France | |
| 8 of January | Albert | Saint Albert bishop | Ireland | |
| 24 of November | Albert | Saint Albert of Louvain | France | 1192 France |
| 14 of September | Albert | Saint Albert of Castel Gualtieri | 1215 Israel | |
| 5 of April | Albert | Saint Albert of Montecorvino | 1127 Italy | |
| 15 of November | Alberto | Saint Albert the Great | 1206 Germany | 1280 Germany |
| 21 of November | Alberto | Saint Alberto of Lieja | Spain | 1192 Spain |
| 12 of September | Albeus | Saint Albeus of Emly | 528 Ireland | |
| 5 of February | Albinus | Saint Albinus | 1006 Italy | |
| 7 of January | Alderic | Saint Alderic | 856 France | |
| 25 of May | Aldhelm | Saint Aldhelm | 709 United kingdom | |
| 26 of February | Alejandro | Saint Alexander | 250 Egypt | 326 Egypt |
| 18 of March | Alexander | Saint Alexander of Jerusalem | 250 Israel | |
| 6 of June | Alexander | Saint Alexander of Fiesole | Italy | 823 Italy |
| 6 of November | Alexander | Saint Alexander Sauli | 1592 Italy | |
| 28 of August | Alexander | Saint Alexander of Constantinople | 336 Turkey | |
| 11 of August | Alexander | Saint Alexander the Charcoal Burner | Italy | |
| 14 of August | Alfredo | Saint Alfred of Hildeseheim | Germany | 874 Germany |
| 15 of August | Alipius | Saint Alipius of Tagaste | 430 Algeria | |
| 12 of March | Alphege | Saint Alphege of Winchester | 951 United kingdom | |
| 19 of April | Alphege | Saint Alphege of Canterbury | 1012 United kingdom | |
| 15 of September | Alpinus | Saint Alpinus of Lyon | France | |
| 7 of September | Alpinus | Saint Alpinus of Chalons | France | |
| 15 of August | Altfrid | Saint Altfrid of Hildesheim | 874 Germany | |
| 8 of August | Altmann | Saint Altmann of Passau | 1091 Austria | |
| 29 of November | Álvaro | Saint Alvaro Pelagio | 1280 Spain | 1352 Spain |
| 28 of January | Amadeus | Saint Amadeus of Lausanne | 1110 France | 1159 Switzerland |
| 26 of October | Amand | Saint Amand of Argentorato | France | |
| 6 of February | Amand | Saint Amand of Elnon | 679 Belgium | |
| 18 of June | Amand | Saint Amand of Burdeaux | 431 France | |
| 8 of April | Amantius | Saint Amantius of Como | Italy | 449 Italy |
| 4 of November | Amantius | Saint Amantius of Rodez | France | |
| 23 of January | Amasius | Saint Amasius bishop | 356 Italy | |
| 1 of May | Amator | Saint Amator of Auxerre | France | 418 France |
| 26 of November | Amator | Saint Amator | ||
| 13 of September | Amatus | Saint Amatus of Sion | 690 France | |
| 30 of September | Amatus | Saint Amatus of Nusco | 1093 Italy | |
| 7 of December | Ambrosio | Saint Ambrose of Milan | 340 Italy | 397 Italy |
| 23 of November | Amphilochius | Saint Amphilochius of Iconium | 395 Turkey | |
| 12 of June | Amphion | Saint Amphion of Nicomedia | Turkey | |
| 25 of September | Anacharius | Saint Anacharius of Auxerre | 605 France | |
| 20 of April | Anastasius | Saint Anastasius of Antioch | 609 Syrian arab republic | |
| 30 of May | Anastasius | Saint Anastasius of Pavia | 680 Italy | |
| 20 of May | Anastasius | Saint Anastasius of Brescia | Italy | |
| 24 of September | Anathalon | Saint Anathalon of Milan | Italy | |
| 3 of July | Anathalon | Saint Anathalon of Laodicea | Syrian arab republic | |
| 3 of July | Anathalon | Saint Anathalon of Constantinople | 458 Turkey | |
| 4 of July | Andrew | Saint Andrew of Crete | 660 Syrian arab republic | 740 Greece |
| 6 of January | Andrew | Saint Andrew Corsini | 1373 Italy | |
| 26 of February | Andrew | Saint Andrew of Florence | 9 Italy | |
| 25 of April | Anianus | Saint Anianus | 67 Egypt | |
| 28 of September | Annemund | Saint Annemund of Lyon | 658 France | |
| 4 of December | Annon | Saint Annon of Cologne | Germany | 1075 Germany |
| 9 of February | Ansbert | Saint Ansbert | 695 France | |
| 18 of March | Anselm | Saint Anselm of Mantua | 1086 Italy | |
| 21 of April | Anselmo | Saint Anselm of Canterbury | 1033 Italy | 1109 United kingdom |
| 3 of May | Ansfried | Saint Ansfried | Netherlands | 1008 Belgium |
| 13 of March | Ansovinus | Saint Ansovinus | 868 Italy | |
| 26 of June | Anthelme | Saint Anthelme of Belley | 1177 France | |
| 24 of April | Anthimus | Saint Anthimus of Nicomedia | 303 Turkey | |
| 7 of June | Anthony | Saint Anthony María Gianelli | 1789 Italy | 1846 Italy |
| 12 of February | Anthony | Saint Anthony Kauleas | 901 Turkey | |
| 17 of June | Antidius | Saint Antidius of Besançon | 411 France | |
| 14 of November | Antigius | Saint Antigius | ||
| 27 of April | Antimus | Saint Antimus bishop and martyr | ||
| 13 of August | Antiochus | Saint Antiochus of Lyon | France | |
| 31 of October | Antoninus | Saint Antoninus of Milán | 661 Italy | |
| 10 of May | Antoninus | Saint Antoninus of Florence | 1389 Italy | 1459 Italy |